All delegates automatically have the option to add information to any free-text box in their profile. However, Meeting Mojo prevents users from adding extra words and phrases to Keyword and other dropdown listings. This is because uncontrolled addition of low-value phrases soon renders search filters useless. As an event manager, you control, and can add new keywords and options to the lists as required.
To learn more about which Custom Fields you can add to your system and how to use them, visit this article.